what procedure do they go about once it dies? and can you tell if it's dying
There are several options for nipple reconstruction including utilizing local tissues vs 3D tattooing.
In the unfortunate event that the nipple graft does not take, a new nipple can be created after the skin heals fully. This can be done with a skin graft taken from a darker skin area of your body. Another choice is to request a nipple/areolar tattoo from an artist. I have seen some very realistic results that tattoo artists have created.